Glock magazine releaseGlock uses three different types of magazine releases. Each magazine release interfaces with a different part of the magazine. (with the front of the Glock magazine facing you) 1. Standard magazine release = uses the mag release cut on the left side of the magazine 2. Ambidextrous magazine release = uses the mag release cut on the front of the magazine 3A. Reversible magazine release, set up on the standard side = uses the mag release cut on the left side of the magazine 3B. Reversible magazine release, set up on the non-standard side = uses the mag release cut on the right side of the magazine

Glock magazine generationsEven though there are currently nine generations of Glock magazines, it is often easier to simplify them down to just four "generations".1. Gen 1 = NFML (non-full metal lining) with left side mag release cut 2. Gen 2 = FML (full metal lining) with left side mag release cut 3. Gen 3 = FML (full metal lining) with left side mag release cut and front side mag release cut 4. Gen 4 = FML (full metal lining) with left and right side mag release cut, may also have front side mag release cut

Summary1. Glocks with the standard magazine release can use all generations of Glock magazines, because all generations incorporate the left side mag release cut. 2. Glocks with the ambidextrous magazine release can only use the Gen 3 and Gen4 mags that have the front side mag release cut. Not included on all gen 3 and 4's, double check the "magazine release" description above.3. Glocks with the reversible magazine release set up on the standard side can use all generations of Glock magazines, because all generations incorporate the left side mag release cut. 4. Glocks with the reversible magazine release set up on the non-standard side can only use the Gen 4 Glock magazines, because that is the only generation that incorporates the right side mag release cut.